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Preparation method of carbon-containing alumina carrier

A technology of alumina carrier and alumina carbon oxide, which is applied in the direction of catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc. It can solve the problems that the inner surface cannot be effectively used, the uniformity of carbon coating on the carrier is difficult to guarantee, and environmental pollution, etc.

Pending Publication Date: 2022-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sucrose molecular chain used in this method is relatively large, which is not conducive to adsorption into the fine pores in the formed alumina carrier, and due to the diffusion effect of the molecules, the sucrose has mobility during the drying process, and it is difficult to achieve carbon in the carrier after the final modification. Evenly distributed
[0009] The above-mentioned patents and documents use alumina particles as the core, and cover the carbon by cracking carbon-containing light components. Since the alumina particles are relatively large, after the outer surface of the large particles of alumina is covered with carbon, the microstructure of the alumina particles The pores are blocked, so the original inner surface of the alumina particles cannot be effectively used, and the mass and heat transfer process is affected to a certain extent
At the same time, for the carbon coating process of pyrolysis carbon source, the gas carbon source or volatile organic matter used as carbon source has safety problems in the pyrolysis process at high temperature, and a large amount of organic waste gas will be generated after pyrolysis, which may cause environmental pollution
In addition, when the above method is used on an industrial scale, it is difficult to ensure the uniformity of the carbon coating on the carrier.

Method used

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  • Preparation method of carbon-containing alumina carrier
  • Preparation method of carbon-containing alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 100 grams of alumina shaped carrier was activated under 300°C air atmosphere for 6 hours, and cooled to room temperature naturally. At room temperature, 32 grams of the liquid material was prepared according to the proportions of water 35%, ethanol 32%, furfuryl alcohol 30%, and oxalic acid 3%. Evaporate at 25°C for 3 hours under a negative pressure of 80kPa, put it into a small microwave oven with a power of 600 watts and heat at 60°C for 10 minutes, then use an oven to dry at 170°C for 12 hours, and finally pass into a tube furnace protected by nitrogen at 550°C The carbon-containing alumina carrier of the present invention is obtained by medium calcination for 3 hours. The obtained product is a cylindrical particle with gray-black surface and cross-section. The electron probe element distribution test shows that the carbon element is evenly distributed. Other properties of the product are shown in Table 1.

Embodiment 2

[0031] 100 grams of alumina shaped carrier was activated under 500°C air atmosphere for 3 hours, and cooled to room temperature naturally. At room temperature, 31 grams of the liquid material was prepared according to the proportions of 48% water, 35% ethanol, 16% furfuryl alcohol, and 1% oxalic acid. After thorough mixing, it was impregnated with the alumina carrier in equal volume. Evaporate at 25°C for 6 hours under a negative pressure of 50kPa, put it into a small microwave oven with a power of 600 watts and heat at 60°C for 10 minutes, then use an oven to dry at 170°C for 12 hours, and finally put it into a tube furnace protected by nitrogen at 550°C The carbon-containing alumina carrier of the present invention is obtained by medium calcination for 3 hours. The obtained product is a cylindrical particle with gray-black surface and cross-section. The electron probe element distribution test shows that the carbon element is evenly distributed. Other properties of the prod...

Embodiment 3

[0033] 100 grams of alumina shaped carrier was activated under 500°C air atmosphere for 3 hours, and cooled to room temperature naturally. At room temperature, 31 grams of the liquid material was prepared according to the proportions of 26% water, 30% ethanol, 40% furfuryl alcohol, and 4% oxalic acid. After thorough mixing, it was impregnated with the alumina carrier in equal volume. Evaporate at 25°C for 6 hours under a negative pressure of 50kPa, put it into a small microwave oven with a power of 600 watts and heat at 60°C for 10 minutes, then use an oven to dry at 170°C for 12 hours, and finally put it into a tube furnace protected by nitrogen at 550°C The carbon-containing alumina carrier of the present invention is obtained by medium calcination for 3 hours. The obtained product is a cylindrical particle with gray-black surface and cross-section. The electron probe element distribution test shows that the carbon element is evenly distributed. Other properties of the prod...

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Abstract

The invention discloses a preparation method of a carbon-containing alumina carrier. The preparation method of the carbon-containing alumina carrier comprises the following steps: (1) activating the alumina carrier, cooling the alumina carrier, immersing the alumina carrier in an aqueous solution containing low-carbon alcohol, furfuryl alcohol and organic dibasic acid for immersion treatment, and separating the carrier after the immersion treatment is finished; and (2) drying the carrier obtained in the step (1), and roasting in an inert atmosphere to obtain the carbon-containing alumina carrier. According to the carbon-containing alumina carrier, the carbon content is flexible and controllable, carbon is uniformly distributed in the carrier, and the interaction strength of the carrier and loaded active metal can be reduced. The method is simple and feasible, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic material preparation, and relates to a preparation method of a carbon-containing alumina carrier. Background technique [0002] Alumina is widely used in heterogeneous catalyst supports, and the properties of alumina supports are one of the key factors that determine the performance of catalysts. [0003] In the catalyst, alumina carrier not only plays the role of dispersing active metals, but also its own surface acidity, interaction with active metals and other effects can greatly affect the morphological structure and stability of active components. [0004] Therefore, taking various measures to modify the support is an important way to improve the catalyst performance. Carbon materials have the characteristics of high specific surface area, good physical and chemical stability, and low interaction with metals, which are also widely used in the preparation of certain catalysts. However, when carbon m...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/04B01J32/00B01J35/10B01J37/02B01J37/08B01J37/34
CPCB01J21/18B01J21/04B01J37/0207B01J37/08B01J37/346B01J35/30B01J35/615
Inventor 杨卫亚王刚隋宝宽袁胜华王少军
Owner CHINA PETROLEUM & CHEM CORP
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